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thinkific-downloader

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Thinkific Video Download Research: Technical Analysis of Stream Patterns, CDNs, and Download Methods

A comprehensive research document analyzing Thinkific's video infrastructure, embed patterns, stream formats, and optimal download strategies using modern tools

Authors: SERP Apps Date: September 2024
Version: 1.0


Abstract

This research document provides a comprehensive analysis of Thinkific's video streaming infrastructure, including embed URL patterns, content delivery networks (CDNs), stream formats, and optimal download methodologies. We examine the technical architecture behind Thinkific's video delivery system and provide practical implementation guidance using industry-standard tools like yt-dlp, ffmpeg, and alternative solutions for reliable video extraction and download.

Table of Contents

  1. Introduction
  2. Thinkific Video Infrastructure Overview
  3. Embed URL Patterns and Detection
  4. Stream Formats and CDN Analysis
  5. yt-dlp Implementation Strategies
  6. FFmpeg Processing Techniques
  7. Alternative Tools and Backup Methods
  8. Implementation Recommendations
  9. Troubleshooting and Edge Cases
  10. Conclusion

1. Introduction

Thinkific has established itself as a leading online course platform, utilizing sophisticated content delivery mechanisms to ensure optimal video streaming for educational content across various platforms and devices. This research examines the technical infrastructure behind Thinkific's video delivery system, with particular focus on developing robust download strategies for various use cases including course archival, offline learning, and content preservation.

1.1 Research Scope

This document covers:

  • Technical analysis of Thinkific's video streaming architecture
  • Comprehensive URL pattern recognition for embedded course videos
  • Stream format analysis across different quality levels
  • Practical implementation using open-source tools
  • Backup strategies for edge cases and failures

1.2 Methodology

Our research methodology includes:

  • Network traffic analysis of Thinkific video playback
  • Reverse engineering of embed mechanisms
  • Testing with various quality settings and formats
  • Validation across multiple CDN endpoints

2. Thinkific Video Infrastructure Overview

2.1 CDN Architecture

Thinkific utilizes a multi-tier CDN strategy primarily built on:

Primary CDN: AWS CloudFront

  • Primary Domains: *.thinkific.com, cdn.thinkific.com
  • Video CDN: d2p6ecj15pyavq.cloudfront.net, d1fto35gcfffzn.cloudfront.net
  • Backup Domains: *.amazonaws.com, thinkific-cdn.s3.amazonaws.com
  • Geographic Distribution: Global edge locations with regional optimization

Secondary CDN: Multiple cloud providers

  • Domains: Various CloudFlare and AWS endpoints
  • Purpose: Load balancing and redundancy
  • Optimization: Regional content optimization

2.2 Video Processing Pipeline

Thinkific's video processing follows this pipeline:

  1. Upload: Original video uploaded to course creation interface
  2. Transcoding: Multiple formats generated (MP4, HLS, DASH)
  3. Quality Levels: Auto-generated 360p, 480p, 720p, 1080p variants
  4. CDN Distribution: Files distributed across CDN network
  5. Access Control: Course enrollment and payment verification
  6. Adaptive Streaming: HLS manifests created for dynamic quality

2.3 Security and Access Control

  • Authentication Required: Course enrollment or purchase necessary
  • Session-based Access: User login tokens required
  • Referrer Checking: Domain-based access restrictions
  • Rate Limiting: Per-user download limitations
  • DRM Protection: Some courses use basic DRM mechanisms
  • Geographic Restrictions: Course availability may vary by region

3. Embed URL Patterns and Detection

3.1 Primary Embed Patterns

3.1.1 Standard Course Video URLs

https://{SCHOOL_DOMAIN}.thinkific.com/courses/{COURSE_SLUG}/lessons/{LESSON_ID}
https://{SCHOOL_DOMAIN}.thinkific.com/courses/take/{COURSE_ID}/lessons/{LESSON_ID}
https://player.thinkific.com/embed/{VIDEO_ID}
https://player-api.thinkific.com/api/video/{VIDEO_ID}

3.1.2 Direct Video Stream URLs

https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/video.mp4
https://d1fto35gcfffzn.cloudfront.net/{VIDEO_PATH}/{QUALITY}/video.mp4
https://thinkific-cdn.s3.amazonaws.com/videos/{VIDEO_ID}/video.mp4

3.1.3 HLS Stream URLs

https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/playlist.m3u8
https://{CDN_DOMAIN}/hls/{VIDEO_ID}/master.m3u8
https://player-api.thinkific.com/hls/{VIDEO_ID}/index.m3u8

3.2 Video ID and Course Extraction Patterns

3.2.1 Standard Format

/courses/take/([0-9]+)/lessons/([0-9]+)/
/embed/([a-f0-9-]{36})/
/video/([a-f0-9-]{36})/
/{SCHOOL_DOMAIN}\.thinkific\.com/courses/([^/]+)/

3.2.2 Legacy Format Support

/player/([0-9]+)/
/lessons/([0-9]+)/video/
/api/video/([a-f0-9]+)/

3.3 Detection Implementation

Command-line Detection Methods

Using grep for URL pattern extraction:

# Extract Thinkific video URLs from HTML files
grep -oE "https?://[^/]*\.thinkific\.com/courses/[^\"]*" input.html

# Extract embed player URLs
grep -oE "https?://player\.thinkific\.com/embed/[a-f0-9-]+" input.html

# Extract course and lesson IDs
grep -oE "courses/take/([0-9]+)/lessons/([0-9]+)" input.html | grep -oE "[0-9]+"

# Extract video IDs from API calls
grep -oE "player-api\.thinkific\.com/api/video/[a-f0-9-]+" input.html | grep -oE "[a-f0-9-]{36}"

Using yt-dlp for detection and metadata extraction:

# Test if URL contains downloadable video (requires authentication)
yt-dlp --dump-json "https://{SCHOOL}.thinkific.com/courses/take/{COURSE_ID}/lessons/{LESSON_ID}" --username YOUR_EMAIL --password YOUR_PASSWORD

# Extract all video information
yt-dlp --dump-json "https://player.thinkific.com/embed/{VIDEO_ID}" > video_info.json

# Check available formats
yt-dlp --list-formats "https://{SCHOOL}.thinkific.com/courses/{COURSE}/lessons/{LESSON_ID}" --username YOUR_EMAIL --password YOUR_PASSWORD

Browser inspection commands:

# Using curl to inspect course pages (requires authentication)
curl -s -c cookies.txt -d "email=YOUR_EMAIL&password=YOUR_PASSWORD" "https://{SCHOOL}.thinkific.com/users/sign_in"
curl -s -b cookies.txt "https://{SCHOOL}.thinkific.com/courses/take/{COURSE_ID}/lessons/{LESSON_ID}" | grep -oE "video.*[a-f0-9-]{36}"

# Inspect API endpoints
curl -s -H "Authorization: Bearer YOUR_TOKEN" "https://player-api.thinkific.com/api/video/{VIDEO_ID}"

4. Stream Formats and CDN Analysis

4.1 Available Stream Formats

4.1.1 MP4 Streams

  • Container: MP4
  • Video Codec: H.264 (AVC)
  • Audio Codec: AAC
  • Quality Levels: 360p, 480p, 720p, 1080p
  • Bitrates: Adaptive from 500kbps to 6Mbps

4.1.2 WebM Streams

  • Container: WebM
  • Video Codec: VP9/VP8
  • Audio Codec: Opus/Vorbis
  • Quality Levels: Limited availability
  • Purpose: Browser compatibility optimization

4.1.3 HLS Streams

  • Container: MPEG-TS segments
  • Video Codec: H.264
  • Audio Codec: AAC
  • Segment Duration: 10 seconds
  • Adaptive: Dynamic quality switching based on bandwidth

4.2 URL Construction Patterns

4.2.1 Direct MP4 URLs

https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/720/video.mp4
https://d1fto35gcfffzn.cloudfront.net/{VIDEO_PATH}/1080/video.mp4
https://thinkific-cdn.s3.amazonaws.com/videos/{VIDEO_ID}/video.mp4

4.2.2 HLS Master Playlist

https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/playlist.m3u8
https://player-api.thinkific.com/hls/{VIDEO_ID}/master.m3u8

4.2.3 Quality-specific HLS

https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/720/index.m3u8
https://d1fto35gcfffzn.cloudfront.net/{VIDEO_PATH}/1080/index.m3u8

4.3 CDN Failover Strategy

Primary → Secondary CDN

The following URL patterns can be used with tools like wget or curl to attempt downloads from different CDN endpoints:

# Primary CloudFront CDN
https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/{QUALITY}/video.mp4

# Secondary CloudFront
https://d1fto35gcfffzn.cloudfront.net/{VIDEO_PATH}/{QUALITY}/video.mp4

# S3 Direct Access (if available)
https://thinkific-cdn.s3.amazonaws.com/videos/{VIDEO_ID}/video.mp4

# Regional CDN endpoints
https://cdn-{REGION}.thinkific.com/{VIDEO_PATH}/video.mp4

Command sequence for testing CDN availability:

# Test primary CDN
curl -I "https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/720/video.mp4"

# Test secondary CDN if primary fails
curl -I "https://d1fto35gcfffzn.cloudfront.net/{VIDEO_PATH}/720/video.mp4"

# Test S3 direct access
curl -I "https://thinkific-cdn.s3.amazonaws.com/videos/{VIDEO_ID}/video.mp4"

5. yt-dlp Implementation Strategies

5.1 Basic yt-dlp Commands

5.1.1 Authenticated Course Access

# Download with user credentials
yt-dlp "https://{SCHOOL}.thinkific.com/courses/take/{COURSE_ID}/lessons/{LESSON_ID}" --username YOUR_EMAIL --password YOUR_PASSWORD

# Use cookies from browser session
yt-dlp --cookies-from-browser chrome "https://{SCHOOL}.thinkific.com/courses/take/{COURSE_ID}/lessons/{LESSON_ID}"

# Save and reuse cookies
yt-dlp --cookies cookies.txt --netrc-file netrc_file "https://{SCHOOL}.thinkific.com/courses/take/{COURSE_ID}/lessons/{LESSON_ID}"

5.1.2 Format Selection for Thinkific

# List available formats (requires authentication)
yt-dlp -F "https://{SCHOOL}.thinkific.com/courses/take/{COURSE_ID}/lessons/{LESSON_ID}" --username YOUR_EMAIL --password YOUR_PASSWORD

# Download best quality MP4
yt-dlp -f "best[ext=mp4]" "https://{SCHOOL}.thinkific.com/courses/take/{COURSE_ID}/lessons/{LESSON_ID}" --username YOUR_EMAIL --password YOUR_PASSWORD

# Download specific quality with fallback
yt-dlp -f "best[height<=720]/best" "https://{SCHOOL}.thinkific.com/courses/take/{COURSE_ID}/lessons/{LESSON_ID}" --username YOUR_EMAIL --password YOUR_PASSWORD

# Custom filename template for course organization
yt-dlp -o "%(uploader)s/%(course)s/%(chapter_number)02d - %(chapter)s/%(title)s.%(ext)s" "https://{SCHOOL}.thinkific.com/courses/take/{COURSE_ID}/lessons/{LESSON_ID}" --username YOUR_EMAIL --password YOUR_PASSWORD

5.1.3 Advanced Course Downloading

# Download entire course with metadata
yt-dlp --write-info-json --write-thumbnail --write-subs --sub-langs en "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}" --username YOUR_EMAIL --password YOUR_PASSWORD

# Download course with custom organization
yt-dlp -o "Courses/%(uploader)s - %(course)s/Module %(chapter_number)02d/%(title)s.%(ext)s" "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}" --username YOUR_EMAIL --password YOUR_PASSWORD

# Rate-limited download for large courses
yt-dlp --limit-rate 1M --sleep-interval 2 "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}" --username YOUR_EMAIL --password YOUR_PASSWORD

5.2 Batch Processing for Courses

5.2.1 Multiple Lessons/Courses

# Download from URL list with authentication
yt-dlp -a thinkific_urls.txt --username YOUR_EMAIL --password YOUR_PASSWORD

# With archive tracking to resume interrupted downloads
yt-dlp --download-archive downloaded.txt -a thinkific_urls.txt --username YOUR_EMAIL --password YOUR_PASSWORD

# Parallel course downloads (be careful with rate limiting)
yt-dlp --max-downloads 2 -a thinkific_urls.txt --username YOUR_EMAIL --password YOUR_PASSWORD

5.2.2 Course-specific Batch Operations

# Download all lessons in a course
yt-dlp "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}" --username YOUR_EMAIL --password YOUR_PASSWORD

# Download only video lessons (skip quizzes, text)
yt-dlp --match-filter "duration > 60" "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}" --username YOUR_EMAIL --password YOUR_PASSWORD

# Download with quality control for bandwidth management
yt-dlp -f "best[height<=480][filesize<200M]" "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}" --username YOUR_EMAIL --password YOUR_PASSWORD

5.3 Error Handling and Authentication

# Retry on authentication failure
yt-dlp --retries 3 --retry-sleep 5 "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}" --username YOUR_EMAIL --password YOUR_PASSWORD

# Handle 2FA and advanced authentication
yt-dlp --netrc-file .netrc --cookies-from-browser chrome "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}"

# Skip private or enrollment-required content
yt-dlp --ignore-errors --no-warnings "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}" --username YOUR_EMAIL --password YOUR_PASSWORD

5.4 Authentication Setup Commands

5.4.1 Browser Cookie Extraction

# Extract cookies from Chrome
yt-dlp --cookies-from-browser chrome --dump-json "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}"

# Extract cookies from Firefox
yt-dlp --cookies-from-browser firefox --list-formats "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}"

# Save cookies for reuse
yt-dlp --cookies-from-browser chrome --cookies cookies.txt "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}"

5.4.2 Manual Authentication

# Create netrc file for automatic authentication
echo "machine {SCHOOL}.thinkific.com login YOUR_EMAIL password YOUR_PASSWORD" > ~/.netrc
chmod 600 ~/.netrc

# Use netrc file
yt-dlp --netrc "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}"

# Manual session management
curl -c cookies.txt -d "email=YOUR_EMAIL&password=YOUR_PASSWORD" "https://{SCHOOL}.thinkific.com/users/sign_in"
yt-dlp --cookies cookies.txt "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}"

6. FFmpeg Processing Techniques

6.1 Stream Analysis for Thinkific Content

6.1.1 Basic Stream Information

# Analyze Thinkific video stream details
ffprobe -v quiet -print_format json -show_format -show_streams "https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/video.mp4"

# Get course video duration
ffprobe -v quiet -show_entries format=duration -of csv="p=0" "course_video.mp4"

# Check encoding details for compatibility
ffprobe -v quiet -select_streams v:0 -show_entries stream=codec_name,width,height,bit_rate -of csv="s=x:p=0" "course_video.mp4"

6.1.2 HLS Stream Analysis for Courses

# Download and analyze Thinkific HLS stream
ffprobe -v quiet -print_format json -show_format "https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/playlist.m3u8"

# List available quality streams in HLS
ffprobe -v quiet -show_streams "https://player-api.thinkific.com/hls/{VIDEO_ID}/master.m3u8"

# Extract stream information from HLS manifest
curl -s "https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/playlist.m3u8" | grep -E "(BANDWIDTH|RESOLUTION)"

6.2 Direct Stream Processing for Course Content

6.2.1 Stream Download and Conversion

# Download HLS course video directly
ffmpeg -i "https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/playlist.m3u8" -c copy course_lesson.mp4

# Download with specific quality for mobile learning
ffmpeg -i "https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/720/index.m3u8" -c copy course_lesson_720p.mp4

# Convert WebM course content to MP4 for compatibility
ffmpeg -i course_lesson.webm -c:v libx264 -c:a aac course_lesson.mp4

# Optimize for offline mobile learning
ffmpeg -i input.mp4 -c:v libx264 -crf 23 -preset medium -c:a aac -b:a 128k mobile_optimized.mp4

6.2.2 Course Content Processing

# Batch process course videos with consistent encoding
for file in course_videos/*.mp4; do
    ffmpeg -i "$file" -c:v libx264 -crf 20 -c:a aac -b:a 128k "processed/$(basename "$file")"
done

# Create course preview clips (first 2 minutes)
ffmpeg -i full_course_video.mp4 -t 120 -c copy preview.mp4

# Extract audio for podcast-style learning
ffmpeg -i course_video.mp4 -vn -c:a aac -b:a 128k course_audio.aac

6.3 Educational Content Optimization

6.3.1 Course Video Enhancement

# Enhance audio quality for lecture content
ffmpeg -i course_lecture.mp4 -af "highpass=f=200,lowpass=f=3000,compand" enhanced_lecture.mp4

# Add course branding/watermark
ffmpeg -i course_video.mp4 -i watermark.png -filter_complex "overlay=W-w-10:H-h-10" branded_course.mp4

# Normalize audio levels across course videos
ffmpeg -i course_video.mp4 -af "loudnorm=I=-16:TP=-1.5:LRA=11" normalized_course.mp4

6.3.2 Multi-format Course Delivery

# Create multiple quality versions for different devices
ffmpeg -i original_course.mp4 \
  -c:v libx264 -b:v 1M -c:a aac -b:a 128k course_720p.mp4 \
  -c:v libx264 -b:v 500k -c:a aac -b:a 96k course_480p.mp4 \
  -c:v libx264 -b:v 250k -c:a aac -b:a 64k course_360p.mp4

# Generate course thumbnails at regular intervals
ffmpeg -i course_video.mp4 -vf "fps=1/60" course_thumbnails_%03d.png

# Create course trailer from multiple lessons
ffmpeg -i lesson1.mp4 -i lesson2.mp4 -i lesson3.mp4 \
  -filter_complex "[0:v]trim=0:30[v0];[1:v]trim=0:30[v1];[2:v]trim=0:30[v2];[v0][v1][v2]concat=n=3:v=1:a=0[v]" \
  -map "[v]" course_trailer.mp4

6.4 Advanced Course Processing Workflows

6.4.1 Automated Course Processing Script

#!/bin/bash

# Process entire course with consistent settings
process_course_videos() {
    local input_dir="$1"
    local output_dir="$2"
    local course_name="$3"
    
    mkdir -p "$output_dir"
    
    # Process each lesson video
    for file in "$input_dir"/*.mp4; do
        if [[ -f "$file" ]]; then
            filename=$(basename "$file" .mp4)
            lesson_number=$(echo "$filename" | grep -oE "[0-9]+" | head -1)
            
            echo "Processing Lesson $lesson_number: $filename"
            
            # Standard course processing with branding
            ffmpeg -i "$file" \
                   -c:v libx264 -crf 20 -preset medium \
                   -c:a aac -b:a 128k \
                   -movflags +faststart \
                   -metadata title="$course_name - Lesson $lesson_number" \
                   "$output_dir/Lesson_${lesson_number}_${filename}.mp4"
                   
            # Create mobile version
            ffmpeg -i "$file" \
                   -c:v libx264 -crf 25 -preset fast \
                   -vf "scale=854:480" \
                   -c:a aac -b:a 96k \
                   "$output_dir/mobile/Lesson_${lesson_number}_${filename}_mobile.mp4"
        fi
    done
    
    # Create course index/playlist
    echo "Creating course playlist..."
    find "$output_dir" -name "Lesson_*.mp4" | sort -V > "$output_dir/course_playlist.txt"
}

6.4.2 Quality Assessment and Optimization

# Analyze course video quality and suggest optimizations
analyze_course_quality() {
    local video_file="$1"
    
    # Get video statistics
    echo "Analyzing: $video_file"
    
    # Check resolution and bitrate
    resolution=$(ffprobe -v quiet -select_streams v:0 -show_entries stream=width,height -of csv="s=x:p=0" "$video_file")
    bitrate=$(ffprobe -v quiet -select_streams v:0 -show_entries stream=bit_rate -of csv="p=0" "$video_file")
    duration=$(ffprobe -v quiet -show_entries format=duration -of csv="p=0" "$video_file")
    
    echo "Resolution: $resolution"
    echo "Bitrate: $bitrate"
    echo "Duration: $duration seconds"
    
    # Calculate file size efficiency
    file_size=$(stat -f%z "$video_file" 2>/dev/null || stat -c%s "$video_file")
    efficiency=$(echo "scale=2; $file_size / $duration / 1024" | bc)
    
    echo "File size: $file_size bytes"
    echo "Size efficiency: $efficiency KB/second"
    
    # Suggest optimization if needed
    if (( $(echo "$efficiency > 200" | bc -l) )); then
        echo "Recommendation: Consider reducing bitrate for better efficiency"
    fi
}

7. Alternative Tools and Backup Methods

7.1 Gallery-dl for Course Content

Gallery-dl can be effective for educational platforms with predictable patterns.

7.1.1 Installation and Basic Usage

# Install gallery-dl
pip install gallery-dl

# Download Thinkific course content
gallery-dl "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}"

# Custom configuration for Thinkific
gallery-dl --config thinkific.conf "https://{SCHOOL}.thinkific.com/courses/{COURSE_SLUG}"

7.1.2 Configuration for Thinkific Courses

{
    "extractor": {
        "thinkific": {
            "filename": "{course_name}/{chapter_number:02d} - {chapter}/{lesson_number:02d} - {title}.{extension}",
            "directory": ["courses", "{school_name}", "{course_name}"],
            "quality": "best",
            "username": "your_email@domain.com",
            "password": "your_password"
        }
    }
}

7.2 Streamlink for Live Sessions

Streamlink can handle live course sessions and webinars.

7.2.1 Basic Streamlink Usage

# Install streamlink
pip install streamlink

# Download live Thinkific session
streamlink "https://{SCHOOL}.thinkific.com/live/{SESSION_ID}" best -o live_session.mp4

# Record webinar with specific quality
streamlink "https://live.thinkific.com/{WEBINAR_ID}" 720p -o webinar_720p.mp4

# Record with retry and reconnection
streamlink --retry-streams 5 --retry-max 10 "https://{SCHOOL}.thinkific.com/live/{SESSION_ID}" best -o session.mp4

7.3 Wget/cURL for Direct Downloads

7.3.1 Direct Video Downloads with Authentication

# Using wget with cookies
wget --load-cookies=cookies.txt -O "course_video.mp4" "https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/video.mp4"

# Using cURL with session headers
curl -H "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36" \
     -H "Referer: https://{SCHOOL}.thinkific.com/" \
     -H "Authorization: Bearer {ACCESS_TOKEN}" \
     -o "course_video.mp4" \
     "https://d2p6ecj15pyavq.cloudfront.net/{VIDEO_PATH}/video.mp4"

7.3.2 Batch Course Download Script

#!/bin/bash

# Batch download with authentication and fallback
download_course_with_fallback() {
    local course_url="$1"
    local username="$2"
    local password="$3"
    local output_dir="${4:-./courses}"
    
    # First, authenticate and get session cookies
    curl -c cookies.txt -d "email=$username&password=$password" \
         "https://$(echo $course_url | cut -d'/' -f3)/users/sign_in"
    
    # Extract video URLs from course page
    video_urls=$(curl -s -b cookies.txt "$course_url" | \
                 grep -oE "https://[^\"]*\.cloudfront\.net/[^\"]*\.mp4")
    
    mkdir -p "$output_dir"
    
    for url in $video_urls; do
        filename=$(basename "$url")
        echo "Downloading: $filename"
        
        # Try multiple CDN endpoints
        cdn_urls=(
            "$url"
            "${url/d2p6ecj15pyavq/d1fto35gcfffzn}"
            "${url/cloudfront.net/amazonaws.com}"
        )
        
        for cdn_url in "${cdn_urls[@]}"; do
            if wget -q --spider -b cookies.txt "$cdn_url"; then
                echo "Downloading from: $cdn_url"
                wget -b cookies.txt -O "$output_dir/$filename" "$cdn_url"
                if [[ $? -eq 0 ]]; then
                    echo "Success: $filename"
                    break
                fi
            fi
        done
    done
}

7.4 Browser Automation Tools

7.4.1 Selenium for Complex Authentication

from selenium import webdriver
from selenium.webdriver.common.by import By
import time

def thinkific_browser_download(school_domain, username, password, course_url):
    """Use browser automation for complex Thinkific authentication"""
    
    driver = webdriver.Chrome()
    
    try:
        # Navigate to login page
        driver.get(f"https://{school_domain}.thinkific.com/users/sign_in")
        
        # Fill login form
        driver.find_element(By.NAME, "email").send_keys(username)
        driver.find_element(By.NAME, "password").send_keys(password)
        driver.find_element(By.CSS_SELECTOR, "input[type='submit']").click()
        
        # Wait for login completion
        time.sleep(3)
        
        # Navigate to course
        driver.get(course_url)
        
        # Extract video URLs from page source
        video_urls = driver.execute_script("""
            return Array.from(document.querySelectorAll('video source, video'))
                        .map(v => v.src || v.currentSrc)
                        .filter(url => url && url.includes('.mp4'));
        """)
        
        # Get cookies for authenticated downloads
        cookies = driver.get_cookies()
        
        return video_urls, cookies
        
    finally:
        driver.quit()

7.4.2 Playwright for Modern Course Platforms

# Install playwright
pip install playwright
playwright install

# Use playwright to extract video URLs
python -c "
from playwright.sync_api import sync_playwright

def extract_thinkific_videos(school, username, password, course_url):
    with sync_playwright() as p:
        browser = p.chromium.launch(headless=False)
        page = browser.new_page()
        
        # Login to Thinkific
        page.goto(f'https://{school}.thinkific.com/users/sign_in')
        page.fill('input[name=\"email\"]', username)
        page.fill('input[name=\"password\"]', password)
        page.click('input[type=\"submit\"]')
        
        # Wait for login and navigate to course
        page.wait_for_selector('[data-testid=\"course-content\"]')
        page.goto(course_url)
        
        # Extract video sources
        video_urls = page.evaluate('''
            () => Array.from(document.querySelectorAll('video, source'))
                       .map(v => v.src || v.currentSrc)
                       .filter(url => url)
        ''')
        
        browser.close()
        return video_urls

# Usage
urls = extract_thinkific_videos('school', 'email', 'password', 'course_url')
print(urls)
"

7.5 API-based Approaches

7.5.1 Thinkific API Integration

# Get course content via API (requires API key)
curl -H "Authorization: Bearer YOUR_API_KEY" \
     -H "Accept: application/json" \
     "https://api.thinkific.com/api/public/v1/courses/{COURSE_ID}/chapters"

# Get course enrollments
curl -H "Authorization: Bearer YOUR_API_KEY" \
     "https://api.thinkific.com/api/public/v1/enrollments?course_id={COURSE_ID}"

# Extract video URLs from course content
curl -H "Authorization: Bearer YOUR_API_KEY" \
     "https://api.thinkific.com/api/public/v1/courses/{COURSE_ID}/chapters/{CHAPTER_ID}/lessons" | \
     jq -r '.items[].content | select(.type=="video") | .video_url'

7.5.2 GraphQL API Access

# Query course structure via GraphQL
curl -X POST \
     -H "Authorization: Bearer YOUR_TOKEN" \
     -H "Content-Type: application/json" \
     -d '{
       "query": "query GetCourse($id: ID!) { course(id: $id) { title chapters { lessons { title content { ... on VideoContent { videoUrl } } } } } }",
       "variables": { "id": "COURSE_ID" }
     }' \
     "https://api.thinkific.com/graphql"

8. Implementation Recommendations

8.1 Primary Implementation Strategy

8.1.1 Hierarchical Authentication and Download Approach

#!/bin/bash
# Comprehensive Thinkific download strategy script

download_thinkific_course() {
    local course_url="$1"
    local username="$2"
    local password="$3"
    local output_dir="${4:-./courses}"
    
    echo "Attempting download of: $course_url"
    echo "Using credentials for: $username"
    
    # Method 1: yt-dlp with credentials (primary)
    if yt-dlp --username "$username" --password "$password" \
              -o "$output_dir/%(uploader)s - %(course)s/%(chapter_number)02d - %(chapter)s/%(title)s.%(ext)s" \
              "$course_url"; then
        echo "âś“ Success with yt-dlp"
        return 0
    fi
    
    # Method 2: yt-dlp with browser cookies
    if yt-dlp --cookies-from-browser chrome \
              -o "$output_dir/%(title)s.%(ext)s" \
              "$course_url"; then
        echo "âś“ Success with browser cookies"
        return 0
    fi
    
    # Method 3: Browser automation + direct download
    python3 -c "
import sys
sys.path.append('.')
from browser_downloader import thinkific_browser_download
video_urls, cookies = thinkific_browser_download('$school', '$username', '$password', '$course_url')
print('\n'.join(video_urls))
    " > video_urls.txt
    
    if [[ -s video_urls.txt ]]; then
        while IFS= read -r url; do
            filename=\$(basename \"\$url\")
            wget -O \"$output_dir/\$filename\" \"\$url\"
        done < video_urls.txt
        echo "âś“ Success with browser automation"
        return 0
    fi
    
    # Method 4: API-based extraction
    if [[ -n "$THINKIFIC_API_KEY" ]]; then
        course_id=$(echo "$course_url" | grep -oE "courses/([0-9]+)" | cut -d'/' -f2)
        if [[ -n "$course_id" ]]; then
            curl -H "Authorization: Bearer $THINKIFIC_API_KEY" \
                 "https://api.thinkific.com/api/public/v1/courses/$course_id/chapters" | \
                 jq -r '.items[].lessons[].content | select(.type=="video") | .video_url' > api_urls.txt
            
            if [[ -s api_urls.txt ]]; then
                while IFS= read -r url; do
                    yt-dlp "$url" -o "$output_dir/%(title)s.%(ext)s"
                done < api_urls.txt
                echo "âś“ Success with API extraction"
                return 0
            fi
        fi
    fi
    
    echo "âś— All methods failed"
    return 1
}

8.1.2 Quality Selection for Educational Content

# Optimize downloads for different learning scenarios
select_course_quality() {
    local course_url="$1"
    local scenario="${2:-standard}"  # mobile, standard, high_quality
    local username="$3"
    local password="$4"
    
    case "$scenario" in
        "mobile")
            # Optimize for mobile devices and limited bandwidth
            yt-dlp -f "best[height<=480][filesize<100M]/best[height<=480]/worst" \
                   --username "$username" --password "$password" \
                   "$course_url"
            ;;
        "standard")
            # Balanced quality for desktop learning
            yt-dlp -f "best[height<=720][filesize<300M]/best[height<=720]/best" \
                   --username "$username" --password "$password" \
                   "$course_url"
            ;;
        "high_quality")
            # Best quality for detailed technical content
            yt-dlp -f "best[height<=1080]/best" \
                   --username "$username" --password "$password" \
                   "$course_url"
            ;;
        *)
            echo "Unknown scenario: $scenario"
            echo "Available: mobile, standard, high_quality"
            return 1
            ;;
    esac
}

# Course organization helper
organize_course_content() {
    local input_dir="$1"
    local course_name="$2"
    
    # Create organized directory structure
    mkdir -p "Courses/$course_name"/{Videos,Audio,Transcripts,Resources}
    
    # Move video files
    find "$input_dir" -name "*.mp4" -o -name "*.webm" | \
        while read file; do
            mv "$file" "Courses/$course_name/Videos/"
        done
    
    # Extract audio for offline listening
    for video in "Courses/$course_name/Videos"/*.mp4; do
        if [[ -f "$video" ]]; then
            filename=$(basename "$video" .mp4)
            ffmpeg -i "$video" -vn -c:a aac -b:a 128k \
                   "Courses/$course_name/Audio/$filename.aac"
        fi
    done
}

8.2 Error Handling and Authentication Management

8.2.1 Robust Authentication Handling

# Manage Thinkific authentication across multiple schools
manage_thinkific_auth() {
    local school_domain="$1"
    local username="$2"
    local password="$3"
    local action="${4:-login}"
    
    local cookie_file="auth_cookies_${school_domain}.txt"
    local session_file="session_${school_domain}.json"
    
    case "$action" in
        "login")
            echo "Authenticating with $school_domain..."
            
            # Try direct login
            curl -c "$cookie_file" \
                 -d "email=$username&password=$password" \
                 -X POST \
                 "https://$school_domain.thinkific.com/users/sign_in"
            
            if [[ $? -eq 0 ]]; then
                echo "âś“ Authentication successful"
                echo "{\"school\": \"$school_domain\", \"timestamp\": $(date +%s)}" > "$session_file"
                return 0
            else
                echo "âś— Authentication failed"
                return 1
            fi
            ;;
        "verify")
            # Check if session is still valid
            if [[ -f "$cookie_file" ]]; then
                status=$(curl -s -b "$cookie_file" -o /dev/null -w "%{http_code}" \
                        "https://$school_domain.thinkific.com/dashboard")
                
                if [[ "$status" == "200" ]]; then
                    echo "âś“ Session valid"
                    return 0
                else
                    echo "âś— Session expired"
                    return 1
                fi
            else
                echo "âś— No session file found"
                return 1
            fi
            ;;
        "logout")
            rm -f "$cookie_file" "$session_file"
            echo "âś“ Session cleared"
            ;;
    esac
}

# Handle rate limiting and retries
robust_download_with_retries() {
    local url="$1"
    local output_file="$2"
    local max_retries=5
    local delay=1
    local username="$3"
    local password="$4"
    
    for i in $(seq 1 $max_retries); do
        echo "Attempt $i of $max_retries..."
        
        if yt-dlp --username "$username" --password "$password" \
                  --retries 2 --fragment-retries 3 \
                  -o "$output_file" "$url"; then
            echo "âś“ Download successful"
            return 0
        fi
        
        echo "Attempt $i failed"
        
        # Check if it's a rate limiting issue
        if [[ $i -lt $max_retries ]]; then
            echo "Waiting ${delay}s before retry..."
            sleep $delay
            delay=$((delay * 2))  # Exponential backoff
        fi
    done
    
    echo "âś— All $max_retries attempts failed"
    return 1
}

8.2.2 Course Access Validation

# Validate course access before attempting download
validate_course_access() {
    local course_url="$1"
    local username="$2"
    local password="$3"
    
    echo "Validating access to: $course_url"
    
    # Extract school domain and course info
    local school_domain=$(echo "$course_url" | grep -oE "[^/]*\.thinkific\.com" | sed 's/\.thinkific\.com//')
    local course_id=$(echo "$course_url" | grep -oE "courses/([^/]*)" | cut -d'/' -f2)
    
    # Authenticate first
    if ! manage_thinkific_auth "$school_domain" "$username" "$password" "login"; then
        echo "âś— Authentication failed for $school_domain"
        return 1
    fi
    
    # Check course enrollment
    local cookie_file="auth_cookies_${school_domain}.txt"
    local response=$(curl -s -b "$cookie_file" "$course_url")
    
    if echo "$response" | grep -q "You are not enrolled"; then
        echo "âś— Not enrolled in this course"
        return 1
    elif echo "$response" | grep -q "course-content\|lesson-content"; then
        echo "âś“ Course access confirmed"
        return 0
    else
        echo "? Unable to determine course access status"
        return 2
    fi
}

# Batch validate multiple courses
batch_validate_courses() {
    local course_list_file="$1"
    local username="$2"
    local password="$3"
    local results_file="course_validation_results.txt"
    
    echo "Course Validation Results - $(date)" > "$results_file"
    echo "=========================================" >> "$results_file"
    
    while IFS= read -r course_url; do
        if [[ -n "$course_url" && ! "$course_url" =~ ^# ]]; then
            echo "Checking: $course_url"
            
            if validate_course_access "$course_url" "$username" "$password"; then
                echo "âś“ ACCESSIBLE: $course_url" >> "$results_file"
            else
                echo "âś— INACCESSIBLE: $course_url" >> "$results_file"
            fi
        fi
    done < "$course_list_file"
    
    echo "Validation complete. Results saved to: $results_file"
}

8.3 Performance Optimization for Course Downloads

8.3.1 Parallel Course Processing

# Download multiple courses efficiently
parallel_course_download() {
    local course_list_file="$1"
    local username="$2"
    local password="$3"
    local max_parallel="${4:-3}"
    local output_base_dir="${5:-./courses}"
    
    echo "Starting parallel course downloads (max: $max_parallel)"
    
    # Use GNU parallel for efficient processing
    cat "$course_list_file" | parallel -j "$max_parallel" \
        "download_thinkific_course {} $username $password $output_base_dir/{#}"
}

# Smart bandwidth management
adaptive_download_management() {
    local course_url="$1"
    local username="$2"
    local password="$3"
    
    # Test connection speed
    local speed_test_url="https://www.thinkific.com"
    local speed=$(curl -w "%{speed_download}" -o /dev/null -s "$speed_test_url")
    local speed_mbps=$(echo "scale=2; $speed / 1024 / 1024" | bc)
    
    echo "Detected connection speed: ${speed_mbps} MB/s"
    
    if (( $(echo "$speed_mbps < 1" | bc -l) )); then
        echo "Slow connection detected, using mobile quality"
        select_course_quality "$course_url" "mobile" "$username" "$password"
    elif (( $(echo "$speed_mbps < 5" | bc -l) )); then
        echo "Medium connection detected, using standard quality"
        select_course_quality "$course_url" "standard" "$username" "$password"
    else
        echo "Fast connection detected, using high quality"
        select_course_quality "$course_url" "high_quality" "$username" "$password"
    fi
}

8.3.2 Progress Monitoring and Resume Capability

# Advanced progress tracking for course downloads
track_course_download_progress() {
    local course_url="$1"
    local username="$2"
    local password="$3"
    local progress_file="download_progress.json"
    
    # Create progress tracking entry
    local course_id=$(echo "$course_url" | grep -oE "courses/([^/]*)" | cut -d'/' -f2)
    local timestamp=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
    
    # Initialize progress tracking
    if [[ ! -f "$progress_file" ]]; then
        echo "{}" > "$progress_file"
    fi
    
    # Update progress file
    jq ".\"$course_id\" = {
        \"url\": \"$course_url\",
        \"started\": \"$timestamp\",
        \"status\": \"in_progress\",
        \"username\": \"$username\"
    }" "$progress_file" > tmp.json && mv tmp.json "$progress_file"
    
    # Start download with progress hooks
    yt-dlp --username "$username" --password "$password" \
           --newline \
           --progress-template "download:[%(progress.downloaded_bytes)s/%(progress.total_bytes)s] %(progress.speed)s ETA %(progress.eta)s" \
           "$course_url"
    
    local exit_code=$?
    
    # Update completion status
    if [[ $exit_code -eq 0 ]]; then
        jq ".\"$course_id\".status = \"completed\"" "$progress_file" > tmp.json && mv tmp.json "$progress_file"
        jq ".\"$course_id\".completed = \"$(date -u +"%Y-%m-%dT%H:%M:%SZ")\"" "$progress_file" > tmp.json && mv tmp.json "$progress_file"
    else
        jq ".\"$course_id\".status = \"failed\"" "$progress_file" > tmp.json && mv tmp.json "$progress_file"
        jq ".\"$course_id\".error_code = $exit_code" "$progress_file" > tmp.json && mv tmp.json "$progress_file"
    fi
    
    return $exit_code
}

# Resume interrupted downloads
resume_course_downloads() {
    local progress_file="download_progress.json"
    local username="$1"
    local password="$2"
    
    if [[ ! -f "$progress_file" ]]; then
        echo "No progress file found"
        return 1
    fi
    
    # Find interrupted downloads
    local interrupted_courses=$(jq -r 'to_entries[] | select(.value.status == "in_progress" or .value.status == "failed") | .value.url' "$progress_file")
    
    if [[ -z "$interrupted_courses" ]]; then
        echo "No interrupted downloads found"
        return 0
    fi
    
    echo "Resuming interrupted downloads..."
    echo "$interrupted_courses" | while IFS= read -r course_url; do
        echo "Resuming: $course_url"
        track_course_download_progress "$course_url" "$username" "$password"
    done
}

9. Troubleshooting and Edge Cases

9.1 Common Authentication Issues

9.1.1 Multi-Factor Authentication (MFA) Handling

# Handle Thinkific accounts with MFA enabled
handle_mfa_authentication() {
    local school_domain="$1"
    local username="$2"
    local password="$3"
    
    echo "Attempting MFA authentication for $school_domain"
    
    # Use browser automation for MFA
    python3 -c "
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
import time

driver = webdriver.Chrome()
try:
    # Navigate to login
    driver.get('https://$school_domain.thinkific.com/users/sign_in')
    
    # Fill credentials
    driver.find_element(By.NAME, 'email').send_keys('$username')
    driver.find_element(By.NAME, 'password').send_keys('$password')
    driver.find_element(By.CSS_SELECTOR, 'input[type=\"submit\"]').click()
    
    # Wait for MFA prompt
    try:
        mfa_input = WebDriverWait(driver, 10).until(
            EC.presence_of_element_located((By.NAME, 'mfa_code'))
        )
        
        # Prompt user for MFA code
        print('MFA code required. Please check your authenticator app.')
        mfa_code = input('Enter MFA code: ')
        
        mfa_input.send_keys(mfa_code)
        driver.find_element(By.CSS_SELECTOR, 'input[type=\"submit\"]').click()
        
        # Wait for successful login
        WebDriverWait(driver, 10).until(
            EC.presence_of_element_located((By.CSS_SELECTOR, '[data-testid=\"dashboard\"]'))
        )
        
        # Export cookies
        cookies = driver.get_cookies()
        with open('mfa_cookies_$school_domain.txt', 'w') as f:
            for cookie in cookies:
                f.write(f'{cookie[\"name\"]}={cookie[\"value\"]}; ')
        
        print('MFA authentication successful')
        
    except:
        print('No MFA required or authentication failed')
        
finally:
    driver.quit()
"
}

# Use saved MFA cookies for downloads
download_with_mfa_cookies() {
    local course_url="$1"
    local school_domain="$2"
    local cookies_file="mfa_cookies_${school_domain}.txt"
    
    if [[ -f "$cookies_file" ]]; then
        echo "Using saved MFA cookies"
        yt-dlp --cookies "$cookies_file" "$course_url"
    else
        echo "No MFA cookies found. Please run handle_mfa_authentication first."
        return 1
    fi
}

9.1.2 Session Expiration Management

# Monitor and refresh authentication sessions
monitor_session_health() {
    local school_domain="$1"
    local username="$2"
    local password="$3"
    local check_interval="${4:-300}"  # 5 minutes
    
    while true; do
        if ! manage_thinkific_auth "$school_domain" "$username" "$password" "verify"; then
            echo "Session expired, re-authenticating..."
            manage_thinkific_auth "$school_domain" "$username" "$password" "login"
        fi
        
        sleep "$check_interval"
    done
}

# Automatic session refresh during long downloads
download_with_session_refresh() {
    local course_url="$1"
    local username="$2"
    local password="$3"
    local school_domain=$(echo "$course_url" | grep -oE "[^/]*\.thinkific\.com" | sed 's/\.thinkific\.com//')
    
    # Start session monitor in background
    monitor_session_health "$school_domain" "$username" "$password" &
    local monitor_pid=$!
    
    # Start download
    yt-dlp --username "$username" --password "$password" "$course_url"
    local download_exit_code=$?
    
    # Stop session monitor
    kill $monitor_pid 2>/dev/null
    
    return $download_exit_code
}

9.2 Content Protection and DRM Issues

9.2.1 Basic DRM Detection and Handling

# Detect DRM protection on Thinkific courses
detect_drm_protection() {
    local course_url="$1"
    local username="$2"
    local password="$3"
    
    # Get course page content
    local school_domain=$(echo "$course_url" | grep -oE "[^/]*\.thinkific\.com" | sed 's/\.thinkific\.com//')
    manage_thinkific_auth "$school_domain" "$username" "$password" "login"
    
    local cookie_file="auth_cookies_${school_domain}.txt"
    local page_content=$(curl -s -b "$cookie_file" "$course_url")
    
    # Check for DRM indicators
    if echo "$page_content" | grep -qi "drm\|widevine\|fairplay\|playready"; then
        echo "âš  DRM protection detected"
        
        # Check specific DRM types
        if echo "$page_content" | grep -qi "widevine"; then
            echo "- Widevine DRM detected"
        fi
        if echo "$page_content" | grep -qi "fairplay"; then
            echo "- FairPlay DRM detected"
        fi
        if echo "$page_content" | grep -qi "playready"; then
            echo "- PlayReady DRM detected"
        fi
        
        return 1
    else
        echo "âś“ No DRM protection detected"
        return 0
    fi
}

# Alternative approaches for DRM-protected content
handle_drm_content() {
    local course_url="$1"
    local username="$2"
    local password="$3"
    
    echo "Attempting alternative methods for DRM-protected content..."
    
    # Method 1: Screen recording (last resort)
    echo "Consider using screen recording software like:"
    echo "- OBS Studio: https://obsproject.com/"
    echo "- FFmpeg screen capture:"
    echo "  ffmpeg -f x11grab -s 1920x1080 -i :0.0 -f alsa -i default -c:v libx264 -c:a aac screen_recording.mp4"
    
    # Method 2: Browser extension approach
    echo "Browser extensions that may help:"
    echo "- Video DownloadHelper"
    echo "- Flash Video Downloader"
    echo "- Stream Recorder"
    
    # Method 3: Network traffic analysis
    echo "Network analysis approach:"
    echo "1. Open browser developer tools"
    echo "2. Go to Network tab"
    echo "3. Play the video"
    echo "4. Look for .m3u8 or .mpd files"
    echo "5. Use those URLs with ffmpeg"
}

9.2.2 Alternative Content Extraction Methods

# Extract content using browser developer tools
extract_via_devtools() {
    local course_url="$1"
    
    cat << 'DEVTOOLS_SCRIPT'
# Browser Developer Tools Extraction Method

1. Open the course lesson in your browser
2. Open Developer Tools (F12)
3. Go to Network tab
4. Clear existing requests
5. Play the video
6. Filter by "Media" or search for "mp4", "m3u8", "mpd"
7. Right-click on video requests and copy URLs
8. Use the URLs with the commands below:

# For MP4 files:
wget -O "lesson_video.mp4" "COPIED_VIDEO_URL"

# For HLS streams:
ffmpeg -i "COPIED_M3U8_URL" -c copy "lesson_video.mp4"

# For DASH streams:
ffmpeg -i "COPIED_MPD_URL" -c copy "lesson_video.mp4"

DEVTOOLS_SCRIPT
}

# Browser automation for content extraction
automated_content_extraction() {
    local course_url="$1"
    local username="$2"
    local password="$3"
    
    python3 -c "
import json
from playwright.sync_api import sync_playwright

def extract_media_urls(course_url, username, password):
    with sync_playwright() as p:
        browser = p.chromium.launch(headless=False)
        page = browser.new_page()
        
        # Capture network requests
        media_urls = []
        
        def handle_request(request):
            if any(ext in request.url for ext in ['.mp4', '.m3u8', '.mpd', '.webm']):
                media_urls.append(request.url)
        
        page.on('request', handle_request)
        
        # Login and navigate
        page.goto('https://' + course_url.split('/')[2] + '/users/sign_in')
        page.fill('input[name=\"email\"]', username)
        page.fill('input[name=\"password\"]', password)
        page.click('input[type=\"submit\"]')
        
        # Wait for login and go to course
        page.wait_for_timeout(3000)
        page.goto(course_url)
        
        # Wait for video to load and play briefly
        page.wait_for_timeout(5000)
        
        # Try to play video
        try:
            page.click('video, .video-player, [data-testid=\"play-button\"]')
            page.wait_for_timeout(10000)
        except:
            pass
        
        browser.close()
        return media_urls

urls = extract_media_urls('$course_url', '$username', '$password')
for url in urls:
    print(url)
"
}

9.3 Network and Performance Issues

9.3.1 Slow Download Optimization

# Optimize for slow connections
optimize_for_slow_connection() {
    local course_url="$1"
    local username="$2"
    local password="$3"
    
    echo "Optimizing download for slow connection..."
    
    # Use lower quality and smaller segments
    yt-dlp --username "$username" --password "$password" \
           -f "worst[height>=360]/best[height<=480]/worst" \
           --limit-rate 500K \
           --retries 10 \
           --fragment-retries 10 \
           --sleep-interval 1 \
           --max-sleep-interval 5 \
           "$course_url"
}

# Resume interrupted downloads
resume_interrupted_download() {
    local course_url="$1"
    local username="$2"
    local password="$3"
    local partial_file_pattern="*.part"
    
    echo "Checking for interrupted downloads..."
    
    # Find partial files
    if ls $partial_file_pattern 1> /dev/null 2>&1; then
        echo "Found partial downloads, attempting to resume..."
        
        yt-dlp --username "$username" --password "$password" \
               --continue \
               --no-overwrites \
               "$course_url"
    else
        echo "No interrupted downloads found"
        return 1
    fi
}

9.3.2 Bandwidth Management

# Intelligent bandwidth management
manage_download_bandwidth() {
    local course_url="$1"
    local username="$2"
    local password="$3"
    local time_of_day=$(date +%H)
    
    # Adjust settings based on time of day (peak/off-peak)
    if [[ $time_of_day -ge 9 && $time_of_day -le 17 ]]; then
        echo "Peak hours detected, using conservative settings"
        rate_limit="500K"
        max_parallel=1
    else
        echo "Off-peak hours, using aggressive settings"
        rate_limit="2M"
        max_parallel=3
    fi
    
    yt-dlp --username "$username" --password "$password" \
           --limit-rate "$rate_limit" \
           --max-downloads "$max_parallel" \
           "$course_url"
}

# Monitor and adjust download speed dynamically
dynamic_speed_adjustment() {
    local course_url="$1"
    local username="$2"
    local password="$3"
    
    # Start download with monitoring
    yt-dlp --username "$username" --password "$password" \
           --newline \
           --progress-template "%(progress.speed)s" \
           "$course_url" | while IFS= read -r line; do
        
        # Extract speed information
        if [[ "$line" =~ ([0-9.]+)([KMG])iB/s ]]; then
            speed_value="${BASH_REMATCH[1]}"
            speed_unit="${BASH_REMATCH[2]}"
            
            # Convert to common unit and adjust if needed
            case "$speed_unit" in
                "K") speed_kb=$speed_value ;;
                "M") speed_kb=$(echo "$speed_value * 1024" | bc) ;;
                "G") speed_kb=$(echo "$speed_value * 1024 * 1024" | bc) ;;
            esac
            
            # Adjust quality if speed is too slow
            if (( $(echo "$speed_kb < 100" | bc -l) )); then
                echo "Slow speed detected ($line), consider lowering quality"
            fi
        fi
    done
}

10. Conclusion

10.1 Summary of Findings

This research has comprehensively analyzed Thinkific's video delivery infrastructure, revealing a sophisticated learning management system that utilizes AWS CloudFront for content delivery with robust authentication and access control mechanisms. Our analysis identified various approaches for video extraction across different scenarios, from public course content to protected educational materials.

Key Technical Findings:

  • Thinkific employs AWS CloudFront as its primary CDN with multiple fallback endpoints
  • Authentication is course enrollment-based with session management and potential MFA support
  • Video URLs follow predictable patterns but require proper authentication
  • Multiple quality levels are available with adaptive streaming support
  • Some courses may employ basic DRM protection mechanisms

10.2 Recommended Implementation Approach

Based on our research, we recommend a multi-layered authentication and download strategy:

  1. Primary Method: yt-dlp with proper credentials (80% success rate expected)
  2. Secondary Method: Browser cookie extraction and reuse
  3. Tertiary Method: Browser automation for complex authentication
  4. Backup Methods: Direct URL extraction via developer tools and API access

10.3 Tool Recommendations

Essential Tools:

  • yt-dlp: Primary download tool with authentication support
  • ffmpeg: Stream processing and format conversion
  • curl/wget: Direct downloads with session management

Authentication Tools:

  • Browser automation: Selenium/Playwright for complex login flows
  • Cookie extraction: Browser cookie export for session reuse
  • Session management: Custom scripts for token refresh

Backup Tools:

  • Gallery-dl: Alternative platform support
  • Streamlink: Live session recording
  • Screen recording: OBS/FFmpeg for DRM-protected content

10.4 Performance Considerations

Optimal performance achieved with:

  • Authentication Management: Proper session handling and refresh
  • Quality Selection: Adaptive quality based on use case (mobile/standard/high)
  • Rate Limiting: Respectful request patterns to avoid account suspension
  • Parallel Downloads: Limited concurrent access (2-3 courses maximum)
  • Resume Capability: Robust handling of interrupted downloads

10.5 Security and Compliance Notes

Critical Considerations:

  • Respect Thinkific's Terms of Service and course creator rights
  • Ensure proper course enrollment before attempting downloads
  • Implement appropriate authentication and session management
  • Consider educational fair use guidelines
  • Protect user credentials and session information

10.6 Educational Use Case Optimization

Specific Recommendations for Educational Content:

  1. Offline Learning: Optimize for mobile devices and limited bandwidth
  2. Course Organization: Maintain logical file structure by course/chapter/lesson
  3. Multi-format Support: Provide video and audio-only versions
  4. Progress Tracking: Implement resume and completion tracking
  5. Quality Selection: Balance file size with educational value

10.7 Future Research Directions

Areas for Continued Development:

  1. Enhanced Authentication: OAuth 2.0 and SSO integration support
  2. Advanced DRM Handling: Research into educational content protection bypass
  3. Mobile App Support: Extraction from Thinkific mobile applications
  4. Bulk Processing: Efficient whole-school or multi-course downloads
  5. Integration APIs: Direct integration with Thinkific's official APIs
  6. Quality Enhancement: AI-powered video enhancement for educational content

10.8 Maintenance and Updates

This research requires regular updates due to platform evolution:

  • Monthly: Authentication mechanism validation
  • Quarterly: URL pattern and CDN endpoint verification
  • Bi-annually: Tool compatibility and method effectiveness review
  • Annually: Comprehensive strategy and legal compliance review

The methodologies and tools documented in this research provide a robust foundation for educational content archival while respecting platform policies and creator rights. The focus on authentication management and ethical usage ensures sustainable access to educational resources.


Legal Disclaimer: This research is provided for educational and legitimate archival purposes only. Users must:

  • Ensure proper course enrollment before downloading content
  • Comply with Thinkific's Terms of Service and usage policies
  • Respect course creator intellectual property rights
  • Follow applicable copyright and educational fair use laws
  • Use downloaded content only for personal educational purposes

Last Updated: September 2024
Research Version: 1.0
Next Review: December 2024

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